A review of sustainable cooling technologies in buildings

Hughes, Ben Richard; Chaudhry, Hassam Nasarullah; Ghаni, Sаud

doi:10.1016/j.rser.2011.03.032

Cited by 135 publications

(58 citation statements)

References 22 publications

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“…Environmental sustainability is one of the key goals of the green real estate development concept, as is well evidenced in current publications on topics such as resource efficiency, energy efficiency, water efficiency and greenhouse gas emission reduction [65][66][67][68][69]. Green technologies are crucial for green property during its construction [70,71].…”

Section: Green Technologies In Real Estate Developmentmentioning

confidence: 97%

Green real estate development in China: State of art and prospect agenda—A review

Zhang

2015

Renewable and Sustainable Energy Reviews

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Section: Green Technologies In Real Estate Developmentmentioning

confidence: 97%

Green real estate development in China: State of art and prospect agenda—A review

Zhang

2015

Renewable and Sustainable Energy Reviews

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“…Over the last two decades, significant efforts have been made on the development and application of various low energy technologies to promote building energy efficiency [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

161

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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“…The findings indicated that a staggered arrangement of three-101 dimensional wings as extended surfaces with an aspect ratio of four and an angle of attack of 14° gave 102 the highest enhancement in heat transfer in comparison to the inline arrangement. In the author's previous works [1,[22][23], the effect of the heat pipes on the performance of the wind 131 catcher was investigated, highlighting the capabilities of the system to deliver the required fresh air 132 rates and cool the ventilated space. Qualitative and quantitative wind tunnel measurements of the 133 airflow through the wind catcher were compared with the computational modelling and good 134 correlation was observed.…”

Section: Previous Related Work 86mentioning

confidence: 99%

“…Therefore, the optimisation of passive cooling using energy-56 efficient heat pipes is of significant interest in the ventilation sector. By incorporating the zero-energy 57 working principles of heat pipes to provide the cooling duty, natural ventilation systems can become 58 an effective and sustainable alternative in keeping the internal environment comfortable [1][2][3]. 59…”

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confidence: 99%

Optimisation and analysis of a heat pipe assisted low-energy passive cooling system

Chaudhry

Calautit

Hughes

2017

Energy and Buildings

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14Passive cooling using windcatchers have been utilised in the past by several Middle East countries to 15 capture wind and provide indoor ventilation and comfort without using energy. Recently, researchers 16 have attempted to improve the cooling performance of windcatchers by incorporating heat pipes. The 17 present work encompasses existing research by optimising the arrangement of heat pipes in natural 18 ventilation airstreams using numerical and experimental tools. The airflow and temperature profiles 19 were numerically predicted using Computational Fluid Dynamics (CFD), the findings of which were 20 quantitatively validated using wind tunnel experimentation. Using a source temperature of 314K or 21 41°C and an inlet velocity of 2.3m/s, the streamwise distance-to-pipe diameter ratio was varied from 22 1.0 to 2.0 and the emergent cooling capacities were established to comprehend the optimum 23 arrangement. The results of this investigation indicated that the heat pipes operate at their maximum 24 efficiency when the streamwise distance is identical to the diameter of the pipe as this formation 25 allows the incoming airstream to achieve the maximum contact time with the surface of the pipes. In 26 addition, the findings showed that any increase in streamwise spacing leads to the formation of a 27 second bell curve representing an increase in air velocity which simultaneously reduces the contact 28 time between the airstream and the heat pipes, decreasing its effectiveness. The study quantified that 29 the optimum streamwise distance was 20mm at which the Sd/D (streamwise distance-to-pipe 30 diameter) ratio was 1.0. The thermal cooling capacity was subsequently found to decrease by 10.7% 31 from 768W to 686W when the streamwise distance was increased to 40mm (Sd/D ratio of 2.0). The 32 technology presented here is subject to an international patent application (PCT/GB2014/052263). 33

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A review of sustainable cooling technologies in buildings

Cited by 135 publications

References 22 publications

Green real estate development in China: State of art and prospect agenda—A review

Green real estate development in China: State of art and prospect agenda—A review

Nano-enhanced phase change materials for improved building performance

Optimisation and analysis of a heat pipe assisted low-energy passive cooling system

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